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Thanks for your reply Al.
When would the timescale (20 years) start from:
Can he legally cut off our services (gas, water, etc.) as he has threatened?
When I started preparing the land for building to start or officially moved in. There was a garage on the land that we used straight away for parking and storing building materials. I'm only asking because from when we moved in to his first letter it is only 18 years.